Komatsu 170-3 Series Shop Manual page 188

TROUBLESHOOTING
User
System with abnormality
code
Abnormality in dual output
529
solenoid B system
Abnormality 2 in idling
551 validation switch system
Abnormality in fuel rail
554
pressure sensor in range
12-218
ACTION TAKEN BY CONTROLLER AND CONDITION OF
Nature of abnormality
• Abnormality has occurred in dual output
solenoid B circuit
ECMB (9):
Circuit open or short circuit detected
• Simultaneous detection of no voltage from
both ON signal and OFF signal of idling
validation switch
ECMB (12): Idling OFF signal
ECMB (13): Idling ON signal
• Fuel rail pressure sensor detected abnor-
mal pressure
Judgment value (reference):
When starting switch is ON:
0.17 MPa {1.76 kg/cm
MACHINE WHEN ERROR CODE IS DISPLAYED
Condition when normal
• Resistance of dual output solenoid B
Between solenoid pins: 28 – 32 Ω
• Resistance of idling switch
Between IVS (A) and (B):
Between IVS (A) and (C):
2
} or more
Max. 125 Ω (pedal released)
Max. 125 Ω (pedal depressed)
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170-3 SERIES